Bloyd Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Lower Pennsylvanian
 ......Morrowan
 .......Bloyd Formation
RTOklahoma
 Arkansas
SNShale consists of (ascending) Brentwood Limestone Member, Woolsey Member and an unnamed shale division. NW Arkansas and E Oklahoma.